Behind Closed Doors by B. A. Paris

Grace waited a long time to find the perfect man - one that would accept the fact that Grace did not come alone but with her young adult sister with Down's Syndrome. When she met Jack she knew it was perfect until they married and Grace became a prisoner in her own home, controlled by Jack who dangled Millie's well being over Grace's head. Their friends only saw the perfect couple, the successful attorney and his beautiful perfect wife living their perfect life. Warning - this is a one sitting book as the suspense and danger increase with every page. It is easy to see why this is already a best seller in Europe and soon it will be on everyone's lips in the US. It will make you take a whole new interest in those perfect power couples as you wonder if you really ever know what happens behind closed doors.